So! Mr Oswald tells Captain Fritz in that first interrogation that he visited the second floor lunchroom, then went down to one to eat his lunch and then went outside to watch the P. Parade. This last obviously comes as a bombshell to those in the interrogation room.
Agent Hosty doesn't believe a word Mr Oswald has said, but dutifully records his claims in his draft interrogation report.
What happens next?
Well! Let's compare
a) the opening of that draft report by Agent Hosty
b) the opening of the subsequent joint Hosty-Bookhout report
c) the opening of Agent Bookhout's later solo report.
a) Agent Hosty draft report: "On 11/22 at 3:15pm LHO was interviewed by Capt W. Fritz, JWB & JPH. Capt F. advised O of his rights etc."
b) Joint Hosty-Bookhout report: "LEE HARVEY OSWALD, 1026 North Beckley, Dallas, Texas, was interviewed by Captain WILL FRITZ of the Homicide Bureau, Dallas Police Department. Special Agent JAMES P. HOSTY and JAMES W. BOOKHOUT were present during this interview. When the Agents entered the interview room at 3:15 p.m., Captain FRITZ had been previously interviewing LEE HARVEY OSWALD for an undetermined period of time. Both Agents identified themselves to OSWALD and advised him they were law enforcement officers and anything he said could be used against him."
c) Solo Bookhout report: "LEE HARVEY OSWALD was interviewed at the Homicide and Robbery Bureau, Dallas Police Department, by Captain J. W. FRITZ in the presence of Special Agent JAMES W. BOOKHOUT, Federal Bureau of Investigation. OSWALD was advised of the identity and official capacity of said agent and the fact that he did not have to make any statement, that any statement he did make could be used in a court of law against him, and that any statement made must be free and voluntary and that he had the right to consult with an attorney."
Notice the personnel change from a)+b) to c)?